Heating apparatus



(No Model.)

H. H. DAW.

HEATING APPARATUS.

No. 463,186. Patented Nov. 17, 1891.

hz azzv UNITED STATES PATENT OFFICE.

HARRY II. DAIV, OF CHICAGO, ILLINOIS.

' HEATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 463,186, dated November 17, 1891.. Application filed March 9, 1891- Serial No. 884,854. (No model.)

To all whom it may concern:

Be it known that I, HARRY I-I. DAW, of Chicago, Ill1no1s, have invented certain new and useful Improvements in I-Ieating Apparatus,

of which the following is a specification.

My invention relates more particularly to apparatus for heating by means of warm air.

In carrying out my invention I construct an air-heating furnace with four cylinders or shells inside each other, the outer and inner ones being air-drums and the two intermediate drums being fire-drums; also, I connect the lower part of theinner drum with a room which is to be heated, so that the drum takes cold air from the room, heats it, and delivers it back to the room; also, I use other details of construction,which will appear hereinafter.

In the accompanying drawings, Figure l is a vertical section, and Fig. 2ahorizontal section on line 2 2 of Fig. 1, of a furnace built according to my invention.

In the drawings, 1 is a casing or cylindrical shell, which may be an ordinary furnaceshell with hot-air lines 2 above and comm unicating with a cold-air box 3 below.

4 is a casing or cylinder inside of 1 and having at its lower end a fire-pot 5, with an ash-pan 6 below it.

7 is a casing or cylinderinside of at, leaving an annular chamber between it and 4, which is divided into two or more parts by partitions 8, reaching from its top nearly but not quite to its bottom. One of these parts communicates with the smoke-pipe 9, and the other communicates by an opening 10 near its top with the interior of a. The tops of 4 and 7 are closed, as shown in Fig. 1.

11 is a casing or cylinder with a closed bot tom inside of 7. Its top is open and communicates with the interior of the outer shell 1. Products of combustion from the fire pass up around 7 in shell at and enter 7 at 10, and thence they pass down in 7 under the edges of partitions S and up again to the smokepipe 9.

12 is a rosette valve at the bottom of shell 7, operated by a handle 13. \Vhen valve 12 is closed, the smoke, &c., pass as stated. IVh en it is open, they pass directly up th rough the valve to the smoke-pipe O, and any dust that mayhave accumulated in 7falls through the valve into the tire-pot. The device is thus self-cleaning.

14 are pipes leading from the cold-air supply to the lower part of the shell 11, so that the air heated therein enters it independently of that heated in shell 1; but both-supplies mingle when heated and pass on through fiues 2.

15 is a pipe leading from aroom to be heated, as at 16, and connecting with one of the pipes 14:, which may have its lower end closed, as shown. Cold air flows from the room 16 through pipe 15, is heated in shell 11, and flows back through one of the dues 2 to the room 16. This provides a method of very rapidly heating a room.

17 is a deflector or shield over the fire to prevent the direct action of the fire on the valve 12 and on the bottom of shell 11. Shells 4- and 11 being radiating-surfaces, a large volume of air is heated by a stove or furnace, which occupies but a small space. The combustion is remarkably perfect, owing to the products of combustion descending in shell 7 and coming in contact with the hot surface of valve 12, and this also makes the draft good.

I claim- 1. The combination, substantially as set forth, of a series of concentric shells, as 1 4. 7 11, with the rosette valve at the bottom of shell 7, and the partitions 8, dividing said. shell longitudinally. I e 2. The combination, substantially as set forth, of the series of concentric shells 1 4 7 1], therosette valve 12, and the deflector 17, arranged as a shield over the fire.

HARRY II. DAIV.

\Vitnesses:

IV. S. BATES, A. C. CALKINS. 

